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Estudo da Puberdade no cavalo puro sangue Lusitano em condições de maneio tradicional
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Resumo(s)
The objective of this work was to study puberty in Lusitano foals and to evaluate the
role of leptin. One-year-old fillies (n=14) and colts (n=19), and two-year-old fillies (n=5) were
kept under extensive management. Blood was collected from the jugular every 11 days from
females for progesterone and leptin analyses. Monthly blood samples were obtained from
males for testosterone and leptin determinations. Between April and June, 57.1% of the
fillies, aged from 12.7 to 16.0 months (13.6±0.7), displayed ovarian activity. Among these,
75% ovulated twice, and 25% ovulated only once. In pubertal fillies, plasma leptin
concentration tended to decrease between pre-puberty and cyclicity, and further decreased
during anestrus (p<0.01). Plasma leptin levels decreased in all fillies between April and
September. Fillies’ body weight increased from the pre-puberal period to cyclicity (p<0.05)
and to anestrus (p<0.01). However, their body condition decreased throughout the
experiment, which might explain leptin fall. Only one colt (5.3%) had testosterone
concentrations above the puberty threshold (0.5ng/ml). Plasma leptin was higher in males
than in females (p<0.01). This study suggests that puberty might be influenced by leptin.
These results should be seen as preliminary, suggesting the need for further research in this
area.
Descrição
Mestrado em Engenharia Zootécnica - Produção Animal - Instituto Superior de Agronomia
Palavras-chave
Lusitano horse puberty progesterone testosterone leptin cavalo puro sangue Lusitano puberdade